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this 24Vac motorized damper features an opposed blade design that ensures balanced airflow with minimal turbulence compared to standard single-blade models
Robertshaw 11-204 Polyphosphate Filter
Operating on 24 Vac power
requiring no bracket modification
York S1-028-12361-700 Pulley Variable 321894-706 this 24Vac motorized damper featuresThe York S1 028 12361 700 Pulley Variable is an essential OEM component designed for precise HVAC blower speed adjustment and airflow balancing. As a variable pitch sheave, this part allows technicians to fine tune the drive ratio by adjusting the distance between the threaded angular discs. When the flanges are moved closer, the belt pitch diameter increases, raising the driven speed; conversely, widening the gap lowers the diameter to reduce fan
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